<!DOCTYPE html>
<html>
<!-- origin: https://embed.plnkr.co/fVIYs97WzjwjYnuDE75u/ -->
  <head>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
  	<div id="dTest"></div>
    <div id="container"></div>
      <h3 id="h3" class="h3">some DOM element</h3>
      <h3 id="h3" class="h31">some DOM element</h3>
      <script src="script.js"></script>
  </body>
</html>